Potassium fluoride,anhydrous
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A hydrofluoric acid wastewater treatment method, characterized by comprising the steps of: Hydrofluoric acid waste liquid in the container and add the precipitating agent in liquid hydrofluoric acid wastewater until hydrofluoric acid PH value of wastewater was 11 or 12, upper liquid, wherein the precipitating agent mass ratio of 1: 0.1 and 0.15 of lime or caustic lime mixture; adding hydrofluoric acid wastewater in the upper liquid dope adjust the PH value to 68, followed by addition of coagulant, mixed precipitation, the supernatant; the supernatant was sequentially filtered using a filter First, cross-flow ultrafiltration to obtain the concentration of water and filtration water, the filtered water is added after the scale inhibitor, and then the reverse osmosis membrane filtration to obtain and reuse waste water; and the concentration of water into the container through a portion of the waste in, and with the mixing said liquid hydrofluoric acid wastewater, and the other part of the waste discharge.

The hydrofluoric acid wastewater treatment method according to claim 1, wherein said coagulant is polyaluminium chloride, polyacrylamide or aluminum sulphate hydrate; the concentration of the added coagulant IPPM 50PPM.

3. The hydrofluoric acid wastewater treatment method according to claim 1, characterized in that the inhibitors of ultra-pure licensing model MPC8668 reverse osmosis membrane scale inhibitor; and adding the scale inhibitor concentration of IPPM 50PPM.

Hydrofluoric acid wastewater treatment method according to claim 1, wherein said filter is a filter of three.

5. The hydrofluoric acid wastewater treatment method according to claim 1, characterized in that the cross-flow ultrafiltration membrane as a molecular weight cutoff I Wan Dalton Dalton 1 million cross-flow ultrafiltration membrane.

Hydrofluoric acid wastewater treatment method according to claim 1, wherein said reverse osmosis membrane type reverse osmosis membrane Dow BW30-365.

Hydrofluoric acid wastewater treatment method according to claim 1, characterized in that the quality of the filtered water, concentrated water and the ratio 20:80 95 5.

8. hydrofluoric acid wastewater treatment method according to claim 1, characterized in that the quality of the effluent and the reflux ratio of waste liquid discharged 1030: 210.

Hydrofluoric acid wastewater treatment method according to claim 1, characterized in that, after the addition of the coagulant and sedimentation time of 10 minutes 120 minutes.